Help installing nightlys from phone download folder

[buckless]

can anyone walk me thru how to install roms that i download directly to my evo,i see them show up in my download folder but do i need to move them, rename them,or in recovery do i just click downloads as the zip i chose to install.i'm running cyangon nightlies,just trying to eliminate downloading to computer then transferring to phone and i'm using astro file manager and clockwork,thanks in advance